Huge tidal surges and a sandbar have claimed many vessels over the years at Hells Gate, the narrow entrance to the vast Macquarie Harbour.

At only 120 metres wide, the hazardous Hells Gate has been a challenge for sailors since it was discovered in 1815.

The entrance is believed to have been named by convicts in reference to the hellish conditions on the Sarah Island penal colony in the harbour.

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